|
gluadys -> RE: Evolution & Racism (5/7/2008 7:50:41 AM)
|
quote:
ORIGINAL: hgomez However... (and you knew there was a however coming) I submit that Darwin was more inclined to link the ape as the predecessor to man because of the black man. And that shows today with nearly every drawing that depicts the evolving man which looks like a morph between a black man and primate. That could well be. Also he tended to accentuate phyletic change over cladistic speciation and that emphasis suggests orthogenesis or a "progressive" tendency in evolution which has since been discarded as having no scientific base. quote:
Can I ask you this... during the coarse of our evolution, did we start our with dark skin or light skin? Depends on what you count as the starting point. At what point in our history did our ancestors lose a significant bodily hair covering. Modern primates like gorillas and chimpanzees have a light skin except where it is not protected by hair. So we can likely set the development of dark skin to coincide with the loss of thick bodily hair. And we don't know just when or why that occurred. If, as some speculate, it was related to adaptation to savannah life and bipedalism, it could have occurred during the evolution of the Australopithecines, even before any species of Homo existed at all. In that case, the first Homo sapiens would have been dark-skinned. quote:
How is it that humans were not separated long enough to form species, but they must have been separated to form different skin colors, hair colors, eye colors, heights, etc. Correct? Yes, there must have been some isolation, just not enough for a long enough time to erect true reproductive barriers. Apparently there has not been sufficient isolation for humanity to even generate a ring species. quote:
What defines a species anyhow? Good question. There is no one definition that fits all cases. Taxonomists use a combination of morphological, behavioral and genetic data. In sexually reproducing populations the willingness and ability to choose mates across populations is a major criterion. quote:
So just so I am clear, there are primate species but only one human species? Yes. "Primate" is a group that includes lemurs, tarsiers ("lower primates") and monkeys as well as hominids. "Hominids" include all the ape species: baboons, orangutans, gorillas, chimpanzees as well as humans. "Hominines" includes all species, living and extinct, of the genus Homo. As it happens, there is only one living species of Homo. If we still shared the planet with other populations of Homo, we might be debating whether "human" included all of them or only our own species.
|
|
|
|